0002

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0002

  1. 1. Today’s Math Question 2009 11 8 0002 a n (n + 1) b r (1) b a n r (2) r = 0.08 b 2a n log10 2 = 0.3010 log10 3 = 0.4771
  2. 2. Today’s Math Answer 0002 (1) a a(1 + r) n (2) b 2a a{(1 + r)n − 1} 2a a(1 + r)n−1 a > 0 a n r = 0.08 S (1 + r)n − 1 2 n−1 n−2 S = a(1 + r) + a(1 + r) + ... (1.08)n 3 1 0 + a(1 + r) + a(1 + r) a (1 + r) n n log10 (1.08) log10 3 n{log10 (33 × 22 × 10−2 )} log10 3 a{(1 + r) − 1} n a{(1 + r) − 1} n S= = n(3 log10 3 + 2 log10 2 − 2) log10 3 (1 + r) − 1 r 0.4771 (n + 1) b n 3 × 0.4771 + 2 × 0.3010 − 2 n 14.3 . . . b = Sr = a{(1 + r)n − 1} . . . . . . n 15 . . . . . .

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